Wang, Y. et al. 2014. Determination of Trace Zinc in Water by Flame Atomic Absorption Spectrometry After Preconcentration by Modified Organobentonite with 1-(2-Pyridylazo)-2-naphthol. Asian Journal of Chemistry. 26, 14 (Jul. 2014), 4442–4444. DOI:https://doi.org/10.14233/ajchem.2014.16871.